Waveguide type second-harmonic generation element and method of producing the same

摘要

A waveguide type second-harmonic generation element includes a substrate (1) made of LiTaO₃, approximately parallel domain inversion regions (30, 30A, 72) formed on the substrate and extending in a first direction, where the domain inversion regions have a first depth into the substrate, approximately parallel domain non-inversion regions (30B, 71) formed on the substrate and extending in the first direction, where the domain inversion region and the domain non-inversion regions alternately occur on the substrate, and an optical waveguide (4, 4A, 4B) formed on the substrate and traversing the domain inversion regions and the domain non-inversion regions, where the optical waveguide has a second depth and extends in a second direction which is approximately perpendicular to the first direction.